This is the new *CloudFormation Template Reference Guide*. Please update your bookmarks and links. For help getting started with CloudFormation, see the [AWS CloudFormation User Guide](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/Welcome.html).

# AWS::ARCRegionSwitch::Plan EventSourceMapping
<a name="aws-properties-arcregionswitch-plan-eventsourcemapping"></a>

<a name="aws-properties-arcregionswitch-plan-eventsourcemapping-description"></a>The `EventSourceMapping` property type specifies Property description not available. for an [AWS::ARCRegionSwitch::Plan](aws-resource-arcregionswitch-plan.md).

## Syntax
<a name="aws-properties-arcregionswitch-plan-eventsourcemapping-syntax"></a>

To declare this entity in your CloudFormation template, use the following syntax:

### JSON
<a name="aws-properties-arcregionswitch-plan-eventsourcemapping-syntax.json"></a>

```
{
  "[Arn](#cfn-arcregionswitch-plan-eventsourcemapping-arn)" : {{String}},
  "[CrossAccountRole](#cfn-arcregionswitch-plan-eventsourcemapping-crossaccountrole)" : {{String}},
  "[ExternalId](#cfn-arcregionswitch-plan-eventsourcemapping-externalid)" : {{String}}
}
```

### YAML
<a name="aws-properties-arcregionswitch-plan-eventsourcemapping-syntax.yaml"></a>

```
  [Arn](#cfn-arcregionswitch-plan-eventsourcemapping-arn): {{String}}
  [CrossAccountRole](#cfn-arcregionswitch-plan-eventsourcemapping-crossaccountrole): {{String}}
  [ExternalId](#cfn-arcregionswitch-plan-eventsourcemapping-externalid): {{String}}
```

## Properties
<a name="aws-properties-arcregionswitch-plan-eventsourcemapping-properties"></a>

`Arn`  <a name="cfn-arcregionswitch-plan-eventsourcemapping-arn"></a>
Property description not available.  
*Required*: Yes  
*Type*: String  
*Pattern*: `^arn:aws[a-zA-Z-]*:lambda:[a-z0-9-]+:\d{12}:event-source-mapping:[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}$`  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`CrossAccountRole`  <a name="cfn-arcregionswitch-plan-eventsourcemapping-crossaccountrole"></a>
Property description not available.  
*Required*: No  
*Type*: String  
*Pattern*: `^arn:aws[a-zA-Z0-9-]*:iam::[0-9]{12}:role/.+$`  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`ExternalId`  <a name="cfn-arcregionswitch-plan-eventsourcemapping-externalid"></a>
Property description not available.  
*Required*: No  
*Type*: String  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)